package com.lzh.java3;

/**
 * @author liuzhihao
 * @create 2021-02-26 23:17
 */

import com.lzh.java2.Person;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * 获取运行时类的方法结构
 *
 */
public class MethodTest {

    @Test
    public void test1(){

        Class clazz = Person.class;

        //getMethods():获取当前运行时类及其所有父类中声明为public权限的方法
        Method[] methods = clazz.getMethods();
        for(Method m : methods){
            System.out.println(m);

        }
        System.out.println();

        //getDeclaredMethods():获取当前运行时类中声明的所有方法（不包含父类声明的方法）
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for(Method m1 : declaredMethods){
            System.out.println(m1);

        }

    }

    /**
     * 权限修饰符  返回值类型   方法名(参数类型1 形参名1，。。。) throws XxxException{}
     */
    @Test
    public void test2(){
        Class clazz = Person.class;
        Method[] methods = clazz.getDeclaredMethods();
        for(Method m : methods){
            //1.获取方法声明的注解
            Annotation[] annotations = m.getAnnotations();
            for(Annotation a : annotations){
                System.out.println(a);

            }

            //2.权限修饰符
            System.out.print(Modifier.toString(m.getModifiers())+ "\t");

            //3.返回值类型
            System.out.print(m.getReturnType().getName() + "\t");

            //4.方法名
            System.out.print(m.getName());
            System.out.println("(");
            //5.形参列表
            Class[] parameterTypes = m.getParameterTypes();
            if(!(parameterTypes == null && parameterTypes.length == 0)){
                for(int i=0;i<parameterTypes.length;i++){
                    if(i == parameterTypes.length -1){
                        System.out.print(parameterTypes[i].getName() + "args_" + i + ",");
                        break;
                    }
                    System.out.print(parameterTypes[i].getName() + "args_" + i + ",");
                }
            }
            System.out.println(")");

            //6.抛出的异常
            Class[] exceptionTypes = m.getExceptionTypes();
//            if(!(exceptionTypes == null && exceptionTypes.length ==0)){
//                System.out.print("throws ");
//                for(int i=0;i<exceptionTypes.length;i++){
//                    if(i == exceptionTypes.length -1){
//                        System.out.println(exceptionTypes[i].getName());
//                        break;
//                    }
//                    System.out.println(exceptionTypes[i].getName() + ",");
//                }
//            }
            if(exceptionTypes.length > 0){
                System.out.print("throws ");
                for(int i=0;i<exceptionTypes.length;i++){
                    if(i == exceptionTypes.length -1){
                        System.out.println(exceptionTypes[i].getName());
                        break;
                    }
                    System.out.println(exceptionTypes[i].getName() + ",");
                }
            }


            System.out.println();
        }


    }

}
